174 



individuals of Dendrerpeton, and three of Hylerpeton^ a new genus 

 of batrachian reptiles, with, a new species of Dendrerpeton. 



Dr. C. T. Jackson read a letter from Dr. Evans, of 

 Oregon Territory, confirming his former opinion that 

 the meteorite recently found in that Territory is iden- 

 tical with the Pallas meteorite of Siberia. 



He also exhibited a specimen of the tin ore of Los 

 Angelos, California. 



Dr. J. Mason Warren exhibited the dissection of a 

 young lioness, two months old. 



November 16, 1859. 



The President in the Chair. 



Dr. White exhibited some living larvae in water, said 

 to have been vomited from the human stomach. They 

 were very active, and belong to the genus Corethra of 

 the family Tipuladce. The person reported to have ejec- 

 ted them had been drinking water from a newly made 

 well, from which the larvaB were drawn ; they probably 

 had never entered the human stomach, where they would 

 have been soon destroyed. The following is a descrip- 

 tion of these larvae : — 



The length |- of an inch ; head lozenge-shaped ; upper jaw 

 proboscis-like, and terminated by a double hook bent down at a 

 right angle ; lower jaw short, and composed of two small hooks 

 directed upward toward base of proboscis. Eyes black and prom- 

 inent ; neck short, followed by a large globose segment furnished 

 with two crescentic inclosed spiracles ; six following segments 

 cylindrical, globose, and tapering to the eighth, which is enlarged 

 to hold a pair of spiracles corresponding to the first ; two termi- 

 nal joints long and tapering, the last furnished with a fan of bris- 

 tles posteriorly and below. 



